School of Mechanical Engineering,, Shanghai Jiao Tong University, Shanghai, China.
IEEE Trans Ultrason Ferroelectr Freq Control. 2009 Dec;56(12):2679-85. doi: 10.1109/TUFFC.2009.1358.
Near-field acoustic levitation (NFAL) has been used in noncontact handling and transportation of small objects to avoid contamination. We have performed a theoretical analysis based on nonuniform vibrating surface to quantify the levitation force produced by the air film and also conducted experimental tests to verify our model. Modal analysis was performed using ANSYS on the flexural plate radiator to obtain its natural frequency of desired mode, which is used to design the measurement system. Then, the levitation force was calculated as a function of levitation distance based on squeeze gas film theory using measured amplitude and phase distributions on the vibrator surface. Compared with previous fluid-structural analyses using a uniform piston motion, our model based on the nonuniform radiating surface of the vibrator is more realistic and fits better with experimentally measured levitation force.
近场声悬浮（NFAL）已被用于小物体的非接触处理和运输，以避免污染。我们进行了基于非均匀振动表面的理论分析，以量化由气膜产生的悬浮力，并进行了实验测试来验证我们的模型。利用 ANSYS 对挠性板辐射器进行模态分析，以获得所需模态的固有频率，然后将其用于设计测量系统。然后，根据挤压气体膜理论，利用振动器表面上测量的振幅和相位分布，计算出悬浮力随悬浮距离的变化。与之前使用均匀活塞运动的流固分析相比，我们基于振动器的非均匀辐射表面的模型更加真实，并且与实验测量的悬浮力更吻合。
